400-490

 A solution of a salt and 100 grams of water that can still dissolve more solute at a given temperature is classified as

• unsaturated

• supersaturated

• saturated

• dilute

• concentrated

The net ionic equation for the reaction between CaCl2 and Na2CO3 to form calcium carbonate and sodium chloride would include all of the following except:

• Ca2+

• CO32–

• 2Na1+

• CaCO3

• All of the substances above would be in the net ionic equation.

Which solution listed below is going to have the highest boiling point?

•  1.5 m NaC

• 1.5 m AgCl

• 2.0 m C6H12O6

• 2.0 m CaCl2

• 1.0 m Al2(SO4)3

Which equation is correctly balanced?

• Na + Cl2 → 2NaCl

• CH4+3O2 →CO2 +H2O

• 2KI + Pb(NO3)2 → 2KNO3 + PbI2

•  H2SO4 + KOH → K2SO4 + H2O

• 6H12O6 + 6O2 → 6CO2 + H2O

What color does the litmus acquire in the aqueous medium of potassium carbonate?

• red 

• green

• blue 

• colorless

Which of the oxides is amphoteric?

•  Zn

• SiO2

• SiO 

• Na2O

How many ions are formed during the dissociation of the (NH4)2SO4 molecule?

• 2

•  9

•  3 

•  4

What substances form Mn2+ ions during dissociation?

• KMnO4

• MnCI2

• Na2MnO4 

• MnO2

Covalent coupling is carried out by:

• electronic clouds  

• valence electrons

• two common electrons, or an electron pair

•  electrostatic forces of attraction

What is the number of neutrons in an atom 31 15 P?

•  31

• 16

• 15

•  46